diff --git a/app/src/main/java/net/nymtech/nymvpn/ui/AppViewModel.kt b/app/src/main/java/net/nymtech/nymvpn/ui/AppViewModel.kt
index f48d5ec..777fd18 100644
--- a/app/src/main/java/net/nymtech/nymvpn/ui/AppViewModel.kt
+++ b/app/src/main/java/net/nymtech/nymvpn/ui/AppViewModel.kt
@@ -86,11 +86,13 @@ constructor(
 			AppUiState(),
 		)
 
-	private fun setCredentialExpiry(instant: Instant) {
-		_uiState.update {
-			it.copy(
-				credentialExpiryTime = instant,
-			)
+	private fun setCredentialExpiry(instant: Instant?) {
+		instant?.let {
+			_uiState.update {
+				it.copy(
+					credentialExpiryTime = instant,
+				)
+			}
 		}
 	}
 
@@ -102,7 +104,7 @@ constructor(
 		}
 	}
 
-	suspend fun onValidCredentialCheck(): Result<Instant> {
+	suspend fun onValidCredentialCheck(): Result<Instant?> {
 		return withContext(viewModelScope.coroutineContext) {
 			val credential = secretsRepository.get().getCredential()
 			if (credential != null) {
@@ -113,7 +115,7 @@ constructor(
 		}
 	}
 
-	private suspend fun getCredentialExpiry(credential: String): Result<Instant> {
+	private suspend fun getCredentialExpiry(credential: String): Result<Instant?> {
 		return vpnClient.get().validateCredential(credential).onFailure {
 			return Result.failure(NymVpnExceptions.InvalidCredentialException())
 		}
diff --git a/app/src/main/java/net/nymtech/nymvpn/ui/screens/settings/credential/CredentialViewModel.kt b/app/src/main/java/net/nymtech/nymvpn/ui/screens/settings/credential/CredentialViewModel.kt
index 7cb7278..df8aee6 100644
--- a/app/src/main/java/net/nymtech/nymvpn/ui/screens/settings/credential/CredentialViewModel.kt
+++ b/app/src/main/java/net/nymtech/nymvpn/ui/screens/settings/credential/CredentialViewModel.kt
@@ -19,7 +19,7 @@ constructor(
 	private val vpnClient: Provider<VpnClient>,
 ) : ViewModel() {
 
-	suspend fun onImportCredential(credential: String): Result<Instant> {
+	suspend fun onImportCredential(credential: String): Result<Instant?> {
 		val trimmedCred = credential.trim()
 		return withContext(viewModelScope.coroutineContext) {
 			vpnClient.get().validateCredential(trimmedCred).onSuccess {
diff --git a/logcat_helper/src/main/java/net/nymtech/logcathelper/LogcatHelper.kt b/logcat_helper/src/main/java/net/nymtech/logcathelper/LogcatHelper.kt
index 3e6ee15..77ee154 100644
--- a/logcat_helper/src/main/java/net/nymtech/logcathelper/LogcatHelper.kt
+++ b/logcat_helper/src/main/java/net/nymtech/logcathelper/LogcatHelper.kt
@@ -104,19 +104,21 @@ object LogcatHelper {
 			val outputFilePath = Paths.get(outputFile.absolutePath)
 			val logcatPath = Paths.get(sourceDir)
 
-			Files.list(logcatPath)
-				.sorted { o1, o2 ->
+			Files.list(logcatPath).use {
+				it.sorted { o1, o2 ->
 					Files.getLastModifiedTime(o1).compareTo(Files.getLastModifiedTime(o2))
 				}
-				.flatMap(Files::lines)
-				.forEach { line ->
-					Files.write(
-						outputFilePath,
-						(line + System.lineSeparator()).toByteArray(),
-						StandardOpenOption.CREATE,
-						StandardOpenOption.APPEND,
-					)
-				}
+					.flatMap(Files::lines).use { lines ->
+						lines.forEach { line ->
+							Files.write(
+								outputFilePath,
+								(line + System.lineSeparator()).toByteArray(),
+								StandardOpenOption.CREATE,
+								StandardOpenOption.APPEND,
+							)
+						}
+					}
+			}
 		}
 
 		override suspend fun getLogFile(): Result<File> {
diff --git a/nym_vpn_client/src/main/java/net/nymtech/vpn/NymVpnClient.kt b/nym_vpn_client/src/main/java/net/nymtech/vpn/NymVpnClient.kt
index 7f394a7..ccd97f0 100644
--- a/nym_vpn_client/src/main/java/net/nymtech/vpn/NymVpnClient.kt
+++ b/nym_vpn_client/src/main/java/net/nymtech/vpn/NymVpnClient.kt
@@ -80,7 +80,7 @@ object NymVpnClient {
 		private val _state = MutableStateFlow(VpnClientState())
 		override val stateFlow: Flow<VpnClientState> = _state.asStateFlow()
 
-		override suspend fun validateCredential(credential: String): Result<Instant> {
+		override suspend fun validateCredential(credential: String): Result<Instant?> {
 			return withContext(ioDispatcher) {
 				try {
 					val expiry = checkCredential(credential)
diff --git a/nym_vpn_client/src/main/java/net/nymtech/vpn/VpnClient.kt b/nym_vpn_client/src/main/java/net/nymtech/vpn/VpnClient.kt
index f545d1a..cc71205 100644
--- a/nym_vpn_client/src/main/java/net/nymtech/vpn/VpnClient.kt
+++ b/nym_vpn_client/src/main/java/net/nymtech/vpn/VpnClient.kt
@@ -16,7 +16,7 @@ interface VpnClient {
 	var exitPoint: ExitPoint
 	var mode: VpnMode
 
-	suspend fun validateCredential(credential: String): Result<Instant>
+	suspend fun validateCredential(credential: String): Result<Instant?>
 
 	@Throws(InvalidCredentialException::class)
 	suspend fun start(context: Context, credential: String, foreground: Boolean = false): Result<Unit>
diff --git a/nym_vpn_client/src/main/java/net/nymtech/vpn/nym_vpn_lib/nym_vpn_lib.kt b/nym_vpn_client/src/main/java/net/nymtech/vpn/nym_vpn_lib/nym_vpn_lib.kt
index 3b83e15..d19f4e2 100644
--- a/nym_vpn_client/src/main/java/net/nymtech/vpn/nym_vpn_lib/nym_vpn_lib.kt
+++ b/nym_vpn_client/src/main/java/net/nymtech/vpn/nym_vpn_lib/nym_vpn_lib.kt
@@ -872,7 +872,7 @@ private fun uniffiCheckContractApiVersion(lib: UniffiLib) {
 
 @Suppress("UNUSED_PARAMETER")
 private fun uniffiCheckApiChecksums(lib: UniffiLib) {
-    if (lib.uniffi_nym_vpn_lib_checksum_func_checkcredential() != 44396.toShort()) {
+    if (lib.uniffi_nym_vpn_lib_checksum_func_checkcredential() != 2527.toShort()) {
         throw RuntimeException("UniFFI API checksum mismatch: try cleaning and rebuilding your project")
     }
     if (lib.uniffi_nym_vpn_lib_checksum_func_getgatewaycountries() != 4475.toShort()) {
@@ -1576,6 +1576,35 @@ public object FfiConverterOptionalDouble: FfiConverterRustBuffer<kotlin.Double?>
 
 
 
+public object FfiConverterOptionalTimestamp: FfiConverterRustBuffer<java.time.Instant?> {
+    override fun read(buf: ByteBuffer): java.time.Instant? {
+        if (buf.get().toInt() == 0) {
+            return null
+        }
+        return FfiConverterTimestamp.read(buf)
+    }
+
+    override fun allocationSize(value: java.time.Instant?): ULong {
+        if (value == null) {
+            return 1UL
+        } else {
+            return 1UL + FfiConverterTimestamp.allocationSize(value)
+        }
+    }
+
+    override fun write(value: java.time.Instant?, buf: ByteBuffer) {
+        if (value == null) {
+            buf.put(0)
+        } else {
+            buf.put(1)
+            FfiConverterTimestamp.write(value, buf)
+        }
+    }
+}
+
+
+
+
 public object FfiConverterOptionalTypePathBuf: FfiConverterRustBuffer<PathBuf?> {
     override fun read(buf: ByteBuffer): PathBuf? {
         if (buf.get().toInt() == 0) {
@@ -1725,8 +1754,8 @@ public object FfiConverterTypeUrl: FfiConverter<Url, RustBuffer.ByValue> {
         FfiConverterString.write(builtinValue, buf)
     }
 }
-    @Throws(FfiException::class) fun `checkCredential`(`credential`: kotlin.String): java.time.Instant {
-            return FfiConverterTimestamp.lift(
+    @Throws(FfiException::class) fun `checkCredential`(`credential`: kotlin.String): java.time.Instant? {
+            return FfiConverterOptionalTimestamp.lift(
     uniffiRustCallWithError(FfiException) { _status ->
     UniffiLib.INSTANCE.uniffi_nym_vpn_lib_fn_func_checkcredential(
         FfiConverterString.lower(`credential`),_status)
diff --git a/nym_vpn_client/src/main/scripts/build-libs.sh b/nym_vpn_client/src/main/scripts/build-libs.sh
index 63aa574..23bd48a 100644
--- a/nym_vpn_client/src/main/scripts/build-libs.sh
+++ b/nym_vpn_client/src/main/scripts/build-libs.sh
@@ -11,9 +11,10 @@ export NDK_TOOLCHAIN_DIR="$1/toolchains/llvm/prebuilt/${archDir}/bin"
 bash $PWD/src/tools/nym-vpn-client/wireguard/build-wireguard-go.sh
 bash $PWD/src/tools/nym-vpn-client/wireguard/libwg/build-android.sh
 echo "Building nym-vpn-lib dep"
+export RUSTFLAGS="-L $PWD/src/tools/nym-vpn-client/build/lib/aarch64-linux-android"
 #fix emulators later
 #(cd $PWD/src/tools/nym-vpn-client/nym-vpn-lib; cargo ndk -t armeabi-v7a -t arm64-v8a -t i686-linux-android -t x86_64-linux-android  -o ../../../main/jniLibs build --release)
-(cd $PWD/src/tools/nym-vpn-client/nym-vpn-lib; cargo ndk -t arm64-v8a -o ../../../main/jniLibs build --release)
+(cd $PWD/src/tools/nym-vpn-client/nym-vpn-core/nym-vpn-lib; cargo ndk -t arm64-v8a -o ../../../../main/jniLibs build --release)
 #mv wireguard
 
 case  "$(uname -s)" in
@@ -22,9 +23,7 @@ case  "$(uname -s)" in
     MINGW*|MSYS_NT*) export RUSTFLAGS="-L ${PWD}/src/tools/nym-vpn-client/build/lib/x86_64-pc-windows-msvc";;
 esac
 
-(cd $PWD/src/tools/nym-vpn-client; cargo run --bin uniffi-bindgen generate --library ./target/aarch64-linux-android/release/libnym_vpn_lib.so  --language kotlin --out-dir ../../main/java/net/nymtech/vpn -n)
-#fix package name
-sed -i 's/package nym-vpn-lib;/package nym_vpn_lib;/g' $PWD/src/main/java/net/nymtech/vpn/nym-vpn-lib/nym_vpn_lib.kt
+(cd $PWD/src/tools/nym-vpn-client/nym-vpn-core; cargo run --bin uniffi-bindgen generate --library ./target/aarch64-linux-android/release/libnym_vpn_lib.so  --language kotlin --out-dir ../../../main/java/net/nymtech/vpn -n)
 
 mv $PWD/src/main/jniLibs/arm64-v8a/libnym_vpn_lib.so $PWD/src/main/jniLibs/arm64-v8a/libnym_vpn_lib.so
 #mv $PWD/src/main/jniLibs/armeabi-v7a/libnym_vpn_lib.so $PWD/src/main/jniLibs/armeabi-v7a/libnym_vpn_lib.so